Subtraction Problem: Finding the Difference When 4 Units are Removed from 34

Subtraction Operations with Base-Ten Block Models

We built the number 34 - we took out 4 units

How many are left?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

We built the number 34 - we took out 4 units

How many are left?

2

Step-by-step solution

To solve this problem of how many units are left after removing 4 units from 34, we'll follow these steps:

  • Step 1: Identify the initial amount and the number of units to remove, which are 34 and 4 respectively.
  • Step 2: Apply the subtraction operation to find the remaining units.
  • Step 3: Perform the subtraction to get the result.

Now, let's carry out these steps:

Step 1: Start with the initial number 34.

Step 2: Remove 4 units by subtracting.

Step 3: Calculate 344 34 - 4 .

Performing the subtraction, we find:

344=30 34 - 4 = 30

Therefore, the number of units left is 30 30 .

According to the multiple-choice options provided, the correct choice is:

  • Option 2: 30 30
3

Final Answer

30 30

Key Points to Remember

Essential concepts to master this topic
  • Operation: Subtraction removes units from the original number
  • Technique: Calculate 344=30 34 - 4 = 30 by taking away 4 units
  • Check: Count remaining blocks: 3 tens + 0 units = 30 ✓

Common Mistakes

Avoid these frequent errors
  • Adding instead of subtracting when removing units
    Don't calculate 34 + 4 = 38 when the problem says 'took out'! Adding gives more units instead of fewer. Always subtract when removing or taking away units from a number.

Practice Quiz

Test your knowledge with interactive questions

If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?

FAQ

Everything you need to know about this question

How do I know when to subtract instead of add?

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Look for key words like 'took out', 'removed', or 'left'. These signal subtraction. When something is taken away, the result is smaller than what you started with.

What do the blocks in the diagram represent?

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The blocks show base-ten representation. Long rectangles are tens (worth 10 each) and small squares are units (worth 1 each). Count them to see the number visually!

Why is 30 the right answer and not 38?

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Because we're removing 4 units from 34. When you take something away, you get less, not more. 344=30 34 - 4 = 30 , which is smaller than 34.

How can I check my subtraction answer?

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Use addition to check! Add your answer to what you subtracted: 30+4=34 30 + 4 = 34 . If you get the original number, you're correct!

What if I can't visualize taking away the blocks?

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Think of it like having 34 toys and giving away 4. You'd have fewer toys left. Subtraction always makes the number smaller when you're taking things away.

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